Hand Detection using EmguCV

Question

I'm new to emguCV. I need to access web camera and detect the hand.then I need to recognize the sign of the hand and add some controls according to the hand sign. first of all I need to detect hand from web camera stream. I have no idea how to start this process. I have some ideas got from research papers. I know that I need to train images but couldn't find any proper process. Are there any tutorials under this topic?? there were some tutorials which were not user friendly and complete.

Answer 1

For any kind of detection in emguCV you first need an xml file called haarcascade, which is used for the actual detection of face/upper body/hand etc. For more info, google it. You can get such a file for hand detection here: http://www.andol.info/hci/1830.htm

Here is an example of the detection code:

Bitmap Source; //your Bitmap
Image<Bgr, byte> ImageFrame = new Image<Bgr, byte>(Source); //image that stores your bitmap

Image<Gray, byte> grayFrame = ImageFrame.Convert<Gray, byte>(); //grayscale of your image

HaarCascade haar = new HaarCascade("yourhaarcascadefile.xml"); //the object used for detection

var faces = grayFrame.DetectHaarCascade(haar, 1.1, 3, HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new System.Drawing.Size(25, 25))[0]; //variable that stores detection information

foreach (var face in faces) 
    ImageFrame.Draw(face.rect, new Bgr(System.Drawing.Color.Green), 3); //draws a rectangle on top of your detection

return ImageFrame.toBitmap(); //returns your bitmap with detection applied;